Workshop Manuals Factory service & repair Land Rover
01 02 AMENDMENT INSTRUCTION SHEET03 INTRODUCTION04 GENERAL SPECIFICATION DATA05 ENGINE TUNING DATA06 GENERAL FITTING REMINDERS07 MAINTENANCE08 ENGINE09 FUEL SYSTEM10 COOLING SYSTEM11 MANIFOLD AND EXHAUST SYSTEM12 CLUTCH13 MANUAL GEARBOX14 TRANSFER GEARBOX15 PROPELLER SHAFTS16 REAR AXLE AND FINAL DRIVE17 FRONT AXLE AND FINAL DRIVE18 STEERING19 FRONT SUSPENSION20 REAR SUSPENSION21 BRAKES22 WHEELS AND TYRES23 CHASSIS AND BODY24 HEATING AND VENTILATION25 AIR CONDITIONING26 WIPERS AND WASHERS27 ELECTRICAL28 INSTRUMENTS
Land Rover 300Tdi Defender27 · ELECTRICAL
27 · Electrical

ALARM SYSTEM COMPONENTS (page 2 of 2)

Make
Land Rover
Model
Defender 300Tdi Defender
ELECTRICALALARM SYSTEM COMPONENTS · page 2 of 2
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ELECTRICAL

3

DESCRIPTION AND OPERATION

Door and bonnet switches

Perimetric protection for the vehicle is provided by
ECU inputs connected to the starter switch, bonnet
switch and door switches.

Ultrasonic sensor

The ultrasonic sensor operates by emitting an air
pressure carrier wave which is subsequently received
by the sensor as it bounces back from objects inside
the vehicle. Once armed, the alarm will sound if wave
is disturbed by a door opening, or if movement is
detected inside the vehicle.

When the volumetric sensor is activated it monitors
movement within the vehicle for 15 seconds before
detecting and responding to intrusions. If the sensor
detects movement it delays arming until a quiet period
has lapsed; if continuous movement is detected, the
alarm will not arm volumetrically.

NOTE: Interior protection will not operate
until 15 seconds after alarm is set.

The ultrasonic sensor is positioned in a different
location, according to vehicle type, as follows:

 

90/110 Station Wagon - RH cantrail trim

 

90/110 Pick-up - On headlining, between interior
lamp and rear view mirror

 

130 Crewcab - On headlining above RH door

Alarm sounder

Two types of alarm sounder can be fitted, one with a
battery back-up facility and or without battery back-up,
both providing an audible warning whenever the alarm
is triggered. The vehicle horn will also operate if the
alarm sounds.

The alarm sounder is fitted to LH inner front wing in
the engine compartment.

NOTE: Disconnecting the battery on
vehicles fitted with the battery backed-up
facility will result in the alarm sounding, if

correct procedure has not been followed.

Engine immobilisation warning light

The engine immobilisation warning light is located on
the instrument panel, and provides a visual indication
that the engine is immobilised.

Anti-theft alarm indicator light

The anti-theft alarm indicator light is located on the
instrument panel, between the fuel and coolant
temperature indicators, and provides a visual
indication of the alarm/ immobiliser status.

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